Alert archive / Maryland / Severe Thunderstorm Warnings in 1990

Severe Thunderstorm Warning 2, NWS Baltimore/Washington

April 2, 1990Frederick County, Maryland

NWS Baltimore/Washington issued this severe thunderstorm warning at Apr 2, 1990, 4:41 PM EDT for Frederick County, Maryland. It was in force for 64 min.

The area

The counties it named.

The facts

Issued
Apr 2, 1990, 4:41 PM EDT (20:41 UTC)
Expired
Apr 2, 1990, 5:45 PM EDT
In force
64 min
Issued by
NWS Baltimore/Washington
Area
Whole counties

County Frederick County, MD

The radar

The WSR-88D network and its archive begin in 1991, so there is no radar volume for this alert.

The nearest sounding before it

Washington/Dulle, VA (KIAD), launched 12:00Z, 8.7 hours before the alert went out and 58 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-pSkew-T log-p diagram, Washington/Dulle, VA at 12:00Z on 1990-04-02Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Washington/Dulle, VA at 12:00Z on 1990-04-02The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 83 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
844 m above ground
0-6 km bulk shear
39 kt
0-1 km storm-relative helicity
83 m²/s²
0-3 km storm-relative helicity
127 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.

The office that day

Everything else NWS Baltimore/Washington issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Apr 2, 5:25 PM EDTSevere Thunderstorm WarningLWXMontgomery65 min
Apr 2, 5:35 PM EDTSevere Thunderstorm WarningLWXLoudoun55 min
Apr 2, 6:08 PM EDTSevere Thunderstorm WarningLWXFauquier67 min
Apr 2, 6:30 PM EDTSevere Thunderstorm WarningLWXFairfax, Prince William60 min

Nearby

Severe Thunderstorm Warnings in Maryland, 1990Every severe thunderstorm warning in 1990

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive.